I bought it from a guy who worked and raced for Sigma. Saffron Frameworks told me it was built by Lee Cooper but I don't have any supporting evidence, little to no info online but either way its pretty unique.
Sigma used to get their frames built in Italy by Billato.
Interesting, I don't know anything about them, there has never seemed to be much online about the Sigmas. Not sure what made him think it was Lee Cooper then...
Sigma used to get their frames built in Italy by Billato.